Liked on YouTube: what is cryptography and network security

what is cryptography and network security

It is a mono-alphabetic cipher wherein each letter of the plaintext is substituted by another letter to form the ciphertext. It is a simplest form of substitution cipher scheme Modern cryptography uses sophisticated mathematical equations (algorithms) and secret keys to encrypt and decrypt data. Today, cryptography is used to provide secrecy and integrity to our data, and both authentication and anonymity to our communications. Network security attacks and services https://youtu.be/-ZHWhaLInik What is network security explained in minutes https://youtu.be/vqavFou2oxk Predefined functions in PHP https://youtu.be/ewmWqm2H-AA Cryptography or cryptology (from Greek κρυπτός kryptós, "hidden, secret"; and γράφειν graphein, "to write", or -λογία -logia, "study", respectively[1]) is the practice and study of techniques for secure communication in the presence of third parties called adversaries.[2] More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages;[3] various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation[4] are central to modern cryptography. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, electrical engineering, communication science, and physics. Applications of cryptography include electronic commerce, chip-based payment cards, digital currencies, computer passwords, and military communications. Cryptography prior to the modern age was effectively synonymous with encryption, the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shared the decoding technique needed to recover the original information only with intended recipients, thereby precluding unwanted persons from doing the same. The cryptography literature often uses the name Alice ("A") for the sender, Bob ("B") for the intended recipient, and Eve ("eavesdropper") for the adversary.[5] Since the development of rotor cipher machines in World War I and the advent of computers in World War II, the methods used to carry out cryptology have become increasingly complex and its application more widespread. Modern cryptography is heavily based on mathematical theory and computer science practice; cryptographic algorithms are designed around computational hardness assumptions, making such algorithms hard to break in practice by any adversary. It is theoretically possible to break such a system, but it is infeasible to do so by any known practical means. These schemes are therefore termed computationally secure; theoretical advances, e.g., improvements in integer factorization algorithms, and faster computing technology require these solutions to be continually adapted. There exist information-theoretically secure schemes that probably cannot be broken even with unlimited computing power—an example is the one-time pad—but these schemes are more difficult to implement than the best theoretically breakable but computationally secure mechanisms. The growth of cryptographic technology has raised a number of legal issues in the information age. Cryptography's potential for use as a tool for espionage and sedition has led many governments to classify it as a weapon and to limit or even prohibit its use and export.[6] In some jurisdictions where the use of cryptography is legal, laws permit investigators to compel the disclosure of encryption keys for documents relevant to an investigation.[7][8] Cryptography also plays a major role in digital rights management and copyright infringement of digital media.[9] -~-~~-~~~-~~-~- How to install wordpress in xampp step by step https://www.youtube.com/watch?v=YdwMhXX-FLE How to create menu and submenu in wordpress https://www.youtube.com/watch?v=PACC3farNPY https://www.youtube.com/watch?v=8kG3JTbGAbw How to install wordpress theme with demo data free How to change footer copyright in wordpress https://www.youtube.com/watch?v=3oIkPWYXyyQ How to change footer widget in wordpress https://www.youtube.com/watch?v=1HbnBbZX9tA How to backup & restore your wordpress website in 3 minutes free 2018 https://www.youtube.com/watch?v=pSr5w4U36c8 How to use the revolution slider plugin with Button Link - full tutorial 2018 https://www.youtube.com/watch?v=KMBFxOlObx4 https://www.youtube.com/watch?v=z5jbofGMOHM How to add new user role in wordpress How To Add YouTube Video To Your WordPress Website 2018 https://www.youtube.com/watch?v=jCWQ7oA2bBA How to add contact form 7 in wordpress page https://www.youtube.com/watch?v=E9U27FOPNyo How to change favicon in wordpress theme https://www.youtube.com/watch?v=uvczOIqdVYk How to use tubebuddy on youtube - 2018 full tutorial https://www.youtube.com/watch?v=N1zpn3sT-2o How to add additional css in wordpress 2018 https://www.youtube.com/watch?v=2L7lHf_0C-E -~-~~-~~~-~~-~-
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